Disorder Induced Phase Transition in a Random Quantum Antiferromagnet

Details Disorder Induced Phase Transition in a Random Quantum Antiferromagnet Disorder Induced Phase Transition in a Random Quantum Antiferromagnet

1994-06-05

arxiv.org/abs/cond-mat/9406025v1

Physics

Condensed Matter

Revtex 3.0, 10 pages + 5 postscript figures available upon request, UCSBTH-94-16

Scientific paper

10.1103/PhysRevLett.74.1226

A two-dimensional Heisenberg model with random antiferromagnetic nearest-neighbor exchange is studied using quantum Monte Carlo techniques. As the strength of the randomness is increased, the system undergoes a transition from an antiferromagnetically ordered ground state to a gapless disordered state. The finite-size scaling of the staggered structure factor and susceptibility is consistent with a dynamic exponent $z = 2$.

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